The change in lipid composition of serum HDL was investigated and effects of Y-9738 on the serum HDL were studied in patients with atherosclerosis.
Methods: Serum was added NaphT MgCl
2 or Heparin Mn and centrifuged at 3000r.p.m. for 10min. HDL cholesterol and HDL phospholipids were determined in the supernatant fraction. Subfraction of phospholipids were separated of the Silicagel G thin layer chromatography. Y-9738 was given orally 900mg/day for 4 months. α
1 lipoprotein was analyzed according to Laurell's immunoelectrophoresis before and after administration of Y-9738.
Results and discussion: (1) The serum with low HDL cholesterol showed a low HDL total phospholipid, low HDL phosphatidyl choline and low ratio of Lysophosphatidyl choline to phosphatidyl choline, but it did not show a low HDL phosphatidyl ethanolamine in patients with atherosclerosis.
Therefore, serum HDL cholesterol levels were not directly proportional to the HDL phospholipid levels, although there was a highly significant correlation between these two variables.
(2) The ratio of HDL cholesterol to HDL phospholipid was low in patients with atherosclerosis as compared with normal subjects. (0.377-0.553)
(3) Y-9738 significantly increased HDL cholesterol, HDL phospholipid and α
1 lipoprotein, regardless of initial HDL cholesterol levels.
These results are quite different from those of previous reports suggesting that some drugs increased the HDL cholesterol in patients with atherosclerosis, only when the initial HDL cholesterol was below the normal values.
(4) No change in the ratio of HDL cholesterol to HDL phospholipids was observed after administration of Y-9738.
A very unbalanced increased of lipids and apoprotein was not observed in HDL after Y-9738 administration.
																			
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